Modeling based on a reference image
I cant see your reference image. If you want to pack the image with the .blend file, you need to go to 
File > External data (at the bottom) > and choose "Pack all into .blend

This will stick the images into the blend file for others to see.

Now you question seems a little vague, you seem to be on the right track. There is nothing inherently wrong with your model. Stick a mirror modifier on there and keep working and you'll be done in no time.

If you don't like how your model looks compared to the image, look at the image and say, "How is my model different?" Then change it.